Choice of sides from newsroom accepted as standard (5)
I believe the answer is:
norma
'standard' is the definition.
(thesaurus)
'choice of sides from newsroom accepted' is the wordplay.
'choice of sides from newsroom' becomes 'norm' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'accepted' becomes 'a' (financial abbreviation).
'norm'+'a'='NORMA'
'as' acts as a link.
(Other definitions for norma that I've seen before include "Marilyn Monroe's real first name" , "Bellini drama" , "She incited Gauls v. Romans (Bellini)" , "Operatic work" , "Opera - ex-PM's wife" .)